TMP88CS38BFG datasheet(49/218 Pages) TOSHIBA

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TMP88CS38B/CM38B/CP38B

2007-09-12

88CS38B-49

2.2.4

Port P5 (P57 to P50)

Port P5 is an 8-bit input/output port which can be configured as an input or an output in

one-bit unit under software control. Input/output mode is specified by the corresponding bit

in the port P5 input/output control register 1 (P5CR1). Port P5 is configured as an input if

its corresponding P5CR1 bit is cleared to “0”, and as an output if its corresponding P5CR1

bit is set to “1”. During reset, P5CR1 is initialized to “0”, which configures port P5 as an

input. The P5 output latches are also initialized to “1”. Data is written into the output latch

regardless of the P5CR1 contents. Therefore initial output data should be written into the

output latch before setting P5CR1.

Port P5 is also used as is also used as AD converter analog input, a pulse width

modulation (PWM) output external interrupt input, timer/counter input, serial bus

interface input/output, and an on screen display (OSD) output (I signal). When used as a

secondary function input pin except I2C bus interface input/output, the input pins should

be set to the input mode. When used as a secondary function output pin except I2C bus

interface input/output, the output pins should be set to the output mode and beforehand

the output latch should be set to “1”. When P52 and P51 are used as I2C bus interface

input/output, P5CR2 bits should be set to the sink open-drain mode, the output latches

should be set to “1”, and the output pins should be set to the output mode. When P57 is used

as an OSD output pin, the output pin should be set to the output mode and beforehand the

port 6 data selection register (PIDS) should be clear to “0”. When used as port P5, the port 6

data selection register (PIDS) should be set to “1”.

Note:

Input mode port is read the state of input pin. When input/output mode is used mixed,

the contents of output latch setting input mode may be changed by executing bit

manipulation instructions.

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